Choke-operated throttle



June 17, 1930. J. GOOD CHOKE OPERATED THROTTLE Filed Feb. 20, 1926Patented June 17, 1930 UNITED STATES PATENT OFFICE JOHN GOOD, OF GARDENCITY, NEW YORK, ASSIGNOB TO GOOD INVENTIONS 00., OF NEW YORK, N. Y., AGOBPOEATION OF NEW YORK CHOKE-OPERATED THROTTLE Application filedFebruary 20, 1926. Seria1 No. 89,553.

The present invention consists in the provision of a suitable connectionbetween the choke and the throttle whereby operation of the chokenecessarily results in a predetermined opening of the throttle.

As a result of this arran ement the engine will turn over somewhat asterthan at the normal idling speed and the device therefore serves as areminder to the driver that the choke is in operation.

Without departing from the spirit of the invention the device can beembodied in numerous forms to suit the particular choking arrangementsobtaining in the various makes of carburetors and it will be understoodthat the following description and the accompanying drawings are merelyexemplary of one particular form of the invention, the form in questionbeing illustrated and described as applied to a carburetor of the zenithtype.

In order that the invention may be readily understood reference is madeto the accompanying drawings in which Fig. 1 shows schematically anautomobile engine hood, throttle and choke arrangements with one form ofthe invention applied thereto, and Fig. 2, shows on'a lar er scale thecarburetor and choke-operated t rottle.

Referring to the drawings in detail, it will be seen that the throttlevalve 1 is operated, as is usual in .this type of carburetor, by therock shaft 2, rock arm 3 and pedal connection 4. Similarly the chokevalve 5 is operated in the usual manner and by means of the rock shaft 6and arm 7. Secured to the shaft 6, or integral with the arm 7, is aquadrant 8 having at the ends of its curved portion stops 9 and 10.Adjacent one end of the curved portion of the quadrant is the Idepression 11 in which seats the end of one arm 12 of a bell crank leverwhich, herein, is secured to the carburetor by and pivoted on the screw13. The arm 14 of this lever extends upwardly to a point adjacent theend of the arm 3 and is provided with an adjusting screw 15. Springmeans is provided to retain the end of the arm 12 in contact with thequadrant 8, such means herein comprising a suitably mounted plunger 16and spring 17. To adjust the gas flow for normal idling there isprovided the usual adjusting screw 18.

' When the choke 19 is withdrawn to close the valve 5, the movement ofthe quadrant 8 will cause the end of the arm 12 to ride up out of thedepression 11 and on to the high part 8 of quadrant 8, which beingconcentric serves to hold open the throttle during further manipulationof control 19 to close the choke. The configuration of the cam surfacesof the quadrant is such that the throttle will be opened abruptly and tothe full extent of the required opening, the amount of this openingdepending on the adjustment of screw 15 but being in any eventsufiicient to facilitate startingand when the engine is running toremind the operator that the choke is in use.

In the particular embodiment of the in- -vention herein illustrated, thechoking physical connectlons as shown or by any other suitable means.

It is also to be understood that the expressions choke and chokinmechanism occurring above and in the ollowing claims are used forconvenience sake to denote any means for temporarily increasing therichness of the fuel mixture and not merel the conventional air intakevalve herein illustrated and accordingly the arrangement andconstruction of the parts herein described are subject to. variationwithout departing from the scope of the following claims.

I claim:

1. In a carburetor, a throttle and choke mechanism interconnectedtherewith to open the throttle by movement of the choke to enrich themixture, the interc nnecting means being1 organized to produce a greaterdegree of t rottle opening when the choke is slightly moved from itsinactive position than during the latter part of its said movement,whereby even a partial use of said choke so increases the normal idlingspeed of an engine as to give appreciable notice to the operator of theenriched condition of the mixture.

2. In a carburetor, a throttle and interconnected choke mechanismorganized to effeet a predetermined opening of the throttle uponmovement of the choke to enrich the mixture, including means whereby theinitial choke movement abruptly produces the whole of said predeterminedthrottle opening. w y 3. In a carburetor, a throttle and interconnectedchoke mechanism organized to effect a predetermined opening of thethrottle upon adjustment of the choke to enrich the mixture including athrottle actuating member, a movable element of the choke mechanismassociated therewith and adapted to operate the same to effect the wholeof said predetermined opening by a partial movement of said element.

4. In 'a carburetor, the combination of a throttle, choke mechanism, acam member havingv an abruptly increasing eccentric surface and afollowing concentric surface, and a throttle actuating member arrangedfor successive engagement with said cam surfaces, said cam connectedwith the choke mechanism for operation coincidently therewith.

In testimony whereof, I have signed this specification.

JOHN GOOD.

